A kind of secondary battery top cover and secondary battery
A secondary battery and top cover technology, applied in the field of lithium ion batteries, can solve problems such as affecting the chemical properties of secondary batteries, and achieve the effects of reducing flammability and improving safety performance
Active Publication Date: 2018-03-20
JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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Problems solved by technology
[0004] The application provides a secondary battery top cover and a secondary battery, which effectively solves the problem of directly adding a flame retardant to the electrolyte to affect the chemical performance of the secondary battery
Method used
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Embodiment Construction
[0025] The present application will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings. The terms "front", "rear", "left", "right", "upper" and "lower" in the text refer to the placement state of the top cover of the secondary battery in the attached drawings.
[0026] Accidents will happen to the secondary battery due to improper charging, short circuit or exposure to high temperature and other harsh environments. At the same time, a large amount of gas will be generated in the battery cell 1 and the temperature will rise sharply. It is easy to cause secondary accidents. In order to avoid secondary accidents, in the prior art, the flame retardant 232 is directly added to the electrolyte of the battery cell 1. The flame retardant 232 can effectively reduce the flammability of the electrolyte and improve the safety performance of the battery cell 1. However, adding flame retardant 232 directly to the battery cell...
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Abstract
The application relates to a secondary battery top cover and a secondary battery, wherein the secondary battery top cover includes a top cover plate, an explosion-proof valve and a flame retardant device, an explosion-proof hole is opened on the top cover plate, and the explosion-proof valve is arranged on the top cover plate and seal the explosion-proof hole. The flame-retardant device is located under the top cover plate and is set corresponding to the explosion-proof valve. There is an exhaust channel between the flame-retardant device and the explosion-proof valve. The flame-retardant device includes a flame-retardant box and a flame-retardant The flame retardant box has a cavity, and the flame retardant is arranged in the cavity. When the flame retardant box reaches the melting point, the flame retardant box melts and releases the flame retardant. The secondary battery top cover and the secondary battery provided by the present application are equipped with a flame retardant device, so that a large amount of gas will be generated when the battery is accidentally charged due to improper charging, short circuit, impact or exposure to high temperature and other harsh environments. When the temperature rises sharply, the flame retardant device is heated and melted and the built-in flame retardant is released into the battery core, thereby reducing the flammability of the electrolyte and improving the safety performance of the battery.
Description
technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a secondary battery top cover and a secondary battery that can effectively improve battery safety performance. Background technique [0002] With the development of social economy and the enhancement of people's awareness of environmental protection, rechargeable secondary batteries are selected as power sources for more and more electrical equipment, such as electric tools, energy storage stations and electric vehicles. This provides a broad space for the application and development of rechargeable secondary batteries. Since electric vehicles and energy storage stations generally need to use large-capacity lithium-ion power batteries as power sources, large-capacity also means high risks. When an accident occurs to the battery due to improper charging, short circuit, impact or exposure to high temperature and other harsh environments, the high-energy bat...
Claims
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IPC IPC(8): H01M2/04H01M2/12H01M10/0525A62C3/16H01M50/147H01M50/342
CPCA62C3/16H01M10/0525H01M50/147H01M50/3425Y02E60/10
Inventor 王宗源
Owner JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED